By submitting my information above, I acknowledge that I have reviewed and agreed to the Privacy Policy and Terms of Use, and I agree to receive marketing messages from WBR, its affiliates and Green Day with the latest news, updates and information about Green Day. Please note that you can opt out of newsletters at any time by clicking on the Unsubscribe link at the bottom of the emails you receive.

Serena Williams is always closely guarded wherever she goes to avoid the threat of stalkers but now, it seems, the boot is on the other foot.

The defending champion is such a big fan of American rock band Green Day that she has lost count of the number of times she has seen them play.

"I'm a bit of a stalker," she joked. "I don't know how many I've been to, maybe too much. It's got to the point where I know the run of the show. I always know when the last song is coming, the encore. So it's a bit much. If I were them, I'd kind of watch out for me."